Concept Reference
These C++20 concepts are defined in the FredEmmott::weak_refs::weak_refs_concepts
namespace, which is inlined into the FredEmmott::weak_refs
namespace. This means that they are available with either:
// Pull in the whole library, including the concepts...
use namespace FredEmmott::weak_refs;
// ... or just the concepts
use namespace FredEmmott::weak_refs::weak_refs_concepts;